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spark plugs

  1. Tuning, Technical Questions
    I have a 90 gtst that has the common misfire problem. It happens at 40-100% throttle around 4000-5500 rpm. I can take the car all the way to redline at 25% no issues. The car holds boost all the way even when the car is misfiring/sputtering. The car idles fine and runs fine otherwise., and...
  2. Tuning, Technical Questions
    ive got a s1 rb25det all stock and i noticed when i pulled my spark plugs out to clean them. #1 and #2 cylinder had coolant dripping from the spark plug. so i assumed it was a head gasket leak but did a compression test and all cylinders were about 150psi. i then heard that it could be my intake...